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      12-02-2019, 09:06 PM   #1
iEatSand
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7 SES codes, bad misfire, was fine prior to VCG

Hey everyone, it seems like the 135i I bought is somewhat of a rat, unfortunately for me, however I plan on piecing it back together and getting it in top shape. I replaced the VCG over the weekend(and coils+plugs). Didn't drive the car since it was needing new tires.

In the process I broke the PVC/vent hose on the valve cover. I ended taping it with ducttape. I noticed that it almost seemed to be melting through the actual tape itself so I'm curious if it's causing a bad leak causing the codes.

I went to Autozone and bought some tape on the way home from the tire shop. I threw the tape on and tried to seal it as best as I could. The SES light went off for about 2 seconds, then back on, then off for the same time, then stayed on.

p0139 O2 sensor circuit slow response
p0140 O2 Sensor Circuit Low Voltage Bank 1 Sensor 2
p0159 O2 sensor slow response bank 2 sensor 2
p142e Fuel?
p0302 Cyl2 misfire
p0303 Cyl3 misfire

I'm wondering/hoping that I just have a vacuum leak... The HPFP looks like it was done not too long ago. Car misfires hard and is sputtering/shaking at low speeds. It stops shaking on decel. I put Autolite Iridiums in the car and gapped them to 020

I might've plugged a connector into the wrong location.

Car is FBO, 92 octane, no meth.

Any ideas? Thanks.
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      12-03-2019, 12:28 AM   #2
iEatSand
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I'll be checking the VGC for leaks tomorrow. Will also retorque the bolts down... Really stumped on this.
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      12-03-2019, 03:10 AM   #3
iminhell1
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I'll go with wrong spark plugs.
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      12-03-2019, 03:47 AM   #4
iEatSand
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Quote:
Originally Posted by iminhell1 View Post
I'll go with wrong spark plugs.
That was my first guess. I just found it odd the misfire was only on 2 cylinders. Which are the same ones that had an issue before my VGC/coil&plug
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      12-03-2019, 12:25 PM   #5
dtla1
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Quote:
Originally Posted by iEatSand View Post
That was my first guess. I just found it odd the misfire was only on 2 cylinders. Which are the same ones that had an issue before my VGC/coil&plug
Yeah but you also mentioned you might have plugged a connector into the wrong location. One connector into the wrong position would also mean there's another in the wrong place, can't just have one in the wrong place.
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      12-03-2019, 12:28 PM   #6
iEatSand
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Quote:
Originally Posted by dtla1 View Post
Yeah but you also mentioned you might have plugged a connector into the wrong location. One connector into the wrong position would also mean there's another in the wrong place, can't just have one in the wrong place.
I think it is my plugs. Not sure about the O2 sensor codes. Car misfires pretty badly on cold start which didn't happen prior
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      12-03-2019, 01:15 PM   #7
Gizmo135i
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Iíd recommend stock bmw plugs, Gapped to .018-.020 for a tuned car. Iíve seen quite a few cars come in misfiring with aftermarket plugs... even bosh. Iím not sure if there is a difference between the bmw ones and the bosh replacement ones (maybe just installation error) but thatís my experience.

Also an intake leak or Crankcase leak could cause misfires like that. I would replace that broken hose while your in there. Could also be a leaking injector or bad coil... take note if any of the plugs are wet or fouled when you remove them.
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      12-03-2019, 06:59 PM   #8
iEatSand
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Changed the plugs with Bosch. Took out the Autolites and the misfire went away. Still some oil seeping into cyl2&3 spark plugs/boots. Not sure why it's still leaking after i just did the VCG. Oh well, more to dig into tomorrow.
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